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Tapping-mode AFM images after deposition of citrate-stabilized Au NPs onto backfilled mixed monolayers: AUDT/mercaptoundecanoic acid (MUA) (a, b) and HeT/mercaptohexanoic acid (MHA) (c, d) to suppress nonspecific adsorption, after washing in a stream of PBS (a, c) and sonication in PBS for 10 min (b, d).
